QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated December 2, 2003 relating to the financial statements that appear in PPT Vision, Inc.'s Annual Report on Form 10-KSB for the year ended October 31, 2003.

/s/  VIRCHOW, KRAUSE & COMPANY, LLP

Minneapolis, Minnesota
June 14, 2004

QuickLinks

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM